import {fromJS} from 'immutable'
import * as constants from './constants';

const defaultState=fromJS({
	topicList:[],
	articleList:[],
	recommendList:[],
	articlePage:1,
	showScroll:false
});

const changeHomeData=(state,action)=>{
	return state.merge({
		topicList:fromJS(action.topicList),
		articleList:fromJS(action.articleList),
		recommendList:fromJS(action.recommendList),
	})
}

const addArticleList=(state,action)=>{
	return state.merge({
		'articleList': state.get('articleList').concat(action.list),
		'articlePage': action.nextPage
	});
}



export default (state=defaultState,action) =>{
  switch(action.type){
		case constants.CHANGE_HOME_DATA:
				return changeHomeData(state,action)
		case constants.ADD_ARTICLE_LIST:
				return addArticleList(state,action)
		case constants.TOGGLE_SCROLL_TOP:
				return state.set('showScroll',action.show)
    default:
			return state;
  }
}